CN107221918A - Exchange microgrid protection faulty action preventing method based on edge direction variable quantity - Google Patents
Exchange microgrid protection faulty action preventing method based on edge direction variable quantity Download PDFInfo
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- CN107221918A CN107221918A CN201710496564.2A CN201710496564A CN107221918A CN 107221918 A CN107221918 A CN 107221918A CN 201710496564 A CN201710496564 A CN 201710496564A CN 107221918 A CN107221918 A CN 107221918A
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- breaker
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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Abstract
Faulty action preventing method, including step are protected the invention discloses a kind of exchange microgrid based on edge direction variable quantity：First, split micro-capacitance sensor region and build the directed arc structure matrix of micro-capacitance sensor；2nd, obtain and flow through the active power instantaneous value of breaker and build side fault message matrix；3rd, failure cut zone is positioned；4th, the failure of failure cut zone is kept；5th, by the high level state signal of breaker, disconnection is performed to association breaker.The present invention can not only carry out accurate fault location to the failure of the multiple cut zone of micro-capacitance sensor; need the data volume of information exchange few; require low to message transmission rate and to the antijamming capability of channel; and it can accurately keep breaker folding; prevent breaker malfunction; ensure the timely recovery after failure, realize the logic adaptivity of micro-capacitance sensor protection.
Description
Technical field
The invention belongs to exchange microgrid Fault Isolation technical field, and in particular to a kind of exchange based on edge direction variable quantity
Microgrid protects faulty action preventing method.
Background technology
Micro-capacitance sensor can fully improve the utilization rate of distributed power source as individually controllable small size power supplying system, meet electricity
Requirement of the Force system to flexibility, stability and security.But because its method of operation is flexible, direction of tide is changeable, its failure
Characteristic and traditional power network are widely different, cause the selectivity of traditional relay protection to face huge challenge.Conventional adaptive guard
Core is real-time update and the calculating of setting valve, but nodes are more, and the on-line calculation of setting valve is huger, and control is single
The processing speed of member just must be faster, and the cost for ultimately resulting in protection device is continuously increased.Therefore existing protection algorism is caused
Theoretical research stage is confined at present, practicality is not had, while the real-time update of protection seting value, being required for having can
Perform the digital relay and highly intelligentized control terminal of complicated algorithm to realize, so when a protection equipment carries out intelligence
Cost increased economy problems are just certainly existed when can change upgrading；In addition, due to needing substantial amounts of data message
Interaction, the speed to data transfer and the antijamming capability requirement more and more higher to channel, will result in Preservation tactics to communication
The problem of depending on unduly.Therefore, nowadays lack that a kind of method is simple, need the data volume of information exchange few, to data transfer
Speed and low is required to the antijamming capability of channel, can not only carry out fault location, moreover it is possible to effectively by the exchange of Fault Isolation
Microgrid protects faulty action preventing method.
The content of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing a kind of based on side side
Faulty action preventing method is protected to the exchange microgrid of variable quantity, it is necessary to which the data volume of information exchange is few, to message transmission rate and to letter
The antijamming capability in road requires low, can not only carry out fault location, and can accurately keep breaker folding, prevents breaker
Malfunction, is easy to promote the use of.
In order to solve the above technical problems, the technical solution adopted by the present invention is：Exchange microgrid based on edge direction variable quantity
Protect faulty action preventing method, it is characterised in that this method comprises the following steps：
Step 1: splitting micro-capacitance sensor region and building the directed arc structure matrix of micro-capacitance sensor：First, with breaker actual bit
It is set in the cut zone that basis marks off micro-capacitance sensor, the cut zone and does not include breaker, the cut zone includes matching somebody with somebody
Net cut section, conveying cut section, load cut section, micro- source cut section and mixing cut section；Then, regulation contacts each cut section
The positive direction of electric current on the breaker in domain, build directed arc structure matrix M and
Wherein, n takes positive integer for the numbering and n of cut zone, and k is the numbering of breaker and k takes positive integer, mijFor directed arc structure Moments
Battle array M in either element andI be positive integer and i=1,
2 ..., n, j be positive integer and j=1,2 ..., k；
Step 2: obtaining the active power instantaneous value for flowing through breaker and building side fault message matrix, process is as follows：
The active power instantaneous value P flowed through in step 201, collection breakerj；
Step 202, according to formulaCalculate the active power Sudden Changing Rate Δ P of j-th of breakerj, wherein,
For active power instantaneous value PjThe average active power in a upper cycle；
Step 203, structure side fault message matrix BFAnd BF=[bF1 bF2 … bFj … bFk], wherein, bFjFor j-th
The fault message of breaker andWherein, PεFor active power instantaneous value PjThreshold value,
bFj=1 represents j-th of breaker starting area failure, bFj=-1 represents j-th of breaker land failure, bFj=0 represents
The equal fault-free of cut zone being joined directly together with j-th of breaker；
Step 3: positioning failure cut zone, process is as follows：
Step 301, first, according to formulaCalculate the Reflector F of i-th of cut zonei, its
In, mij·bFj≠0；Then, build cut zone Reflector matrix F and
Step 302, judge whether broken down in cut zone：According to Reflector FiValue judge i-th segmentation
Whether broken down in region, as Reflector FiDuring equal to 1, broken down in i-th of cut zone, i-th of cut zone
For failure cut zone；Otherwise, i-th of cut zone is non-faulting cut zone；
Step 4: the failure of failure cut zone is kept, process is as follows：
Step 401, setting fault-signal count flag matrix F J：Fault-signal is set to count mark for Reflector matrix F
Any fault-signal count flag FJ in will matrix F J and fault-signal count flag matrix F JiOriginal state be low electricity
It is flat, wherein, fault-signal count flag FJiFor Reflector FiFault-signal count flag and FJi=0；
The fault-signal count flag saltus step of step 402, failure cut zone：By the failure obtained in step 302 segmentation
The corresponding fault-signal count flag FJ in regioniState from the saltus step of low level 0 be high level 1, it is non-by what is obtained in step 302
The corresponding fault-signal count flag state of failure cut zone keeps low level 0；
Step 404, according to formulaCalculate failure and update mark Fi', to Reflector FiCarry out more
Newly, wherein, x be positive integer and
Step 5: according to formulaCalculate the status signal S of j-th of breakerBj, lead to
The high level state signal of breaker is crossed, disconnection is performed to association breaker, wherein, F 'αFor the α cut zone failure more
New mark, F 'δMark is updated for the failure of the δ cut zone, and j-th of breaker connects α cut zone and δ
Cut zone, α, β, δ, ε be positive integer and
The above-mentioned protection faulty action preventing method of the exchange microgrid based on edge direction variable quantity, it is characterised in that：The breaker
For digital breaker.
The above-mentioned protection faulty action preventing method of the exchange microgrid based on edge direction variable quantity, it is characterised in that：Institute in step 201
State the active power instantaneous value P flowed through on breakerjGathered by active power sensor.
The above-mentioned protection faulty action preventing method of the exchange microgrid based on edge direction variable quantity, it is characterised in that：It is describedT is the sampling period, and p (t) is active power instantaneous value PjAny sampling active power in a upper cycle.
The present invention has advantages below compared with prior art：
1st, the present invention is directed to the design feature of micro-capacitance sensor, uses the thought using breaker as border to be divided micro-capacitance sensor
Cut, the positive direction of electric current on the breaker by providing to contact each cut zone builds directed arc structure matrix, collection open circuit
The active power instantaneous value flowed through on device, Network topology is carried out according to the protection philosophy of edge direction variable quantity to micro-capacitance sensor,
Fault location is carried out to cut zone, is easy to promote the use of.
2nd, the active power instantaneous value of breaker is flowed through in the present invention only collection, and the active of breaker is flowed through by real-time sampling
Power carrys out active power variable quantity i.e. Sudden Changing Rate in the unit of account sampling time, is obtained after Sudden Changing Rate is compared with threshold value
Side fault information volume, side fault information volume is realized after the matrix algorithm processing of Network topology to be needed with fault location
Want the data volume of information exchange few, require low to message transmission rate and to the antijamming capability of channel, it is reliable and stable, use effect
It is really good.
3rd, the inventive method step is simple, by for Reflector arranged in matrix fault-signal count flag matrix and failure
The original state of any fault-signal count flag in signal-count mark matrix is low level, passes through failure cut zone
The saltus step of fault-signal count flag and update Reflector, realize failure cut zone failure keep, it is to avoid micro-capacitance sensor tide
Flow direction changeable, cause the Reflector matrix of cut zone to change, and then cause breaker malfunction, be easy to promote the use of.
In summary, the present invention can not only carry out accurate fault location to the failure of the multiple cut zone of micro-capacitance sensor,
Need the data volume of information exchange few, require low to message transmission rate and to the antijamming capability of channel, and can accurately protect
Breaker folding is held, breaker malfunction is prevented, it is ensured that the timely recovery after failure, realizes that the logic of micro-capacitance sensor protection is adaptive
Property, it is easy to promote the use of.
Below by drawings and examples, technical scheme is described in further detail.
Brief description of the drawings
Fig. 1 is the cut zone figure of the micro-capacitance sensor of the embodiment of the present invention.
Fig. 2 is Fig. 1 topology diagram.
Fig. 3 protects the FB(flow block) of faulty action preventing method for present invention exchange microgrid.
Fig. 4 flows through the active power mutation signal of the 1st breaker when there is failure for the micro-capacitance sensor of the embodiment of the present invention
Figure.
Fig. 5 flows through the active power mutation signal of the 2nd breaker when there is failure for the micro-capacitance sensor of the embodiment of the present invention
Figure.
Fig. 6 flows through the active power mutation signal of the 3rd breaker when there is failure for the micro-capacitance sensor of the embodiment of the present invention
Figure.
Fig. 7 flows through the active power mutation signal of the 4th breaker when there is failure for the micro-capacitance sensor of the embodiment of the present invention
Figure.
Fig. 8 flows through the active power mutation signal of the 5th breaker when there is failure for the micro-capacitance sensor of the embodiment of the present invention
Figure.
Embodiment
As shown in Figure 1 to Figure 3, the exchange microgrid protection faulty action preventing method of the invention based on edge direction variable quantity, including
Following steps：
Step 1: splitting micro-capacitance sensor region and building the directed arc structure matrix of micro-capacitance sensor：First, with breaker actual bit
It is set in the cut zone that basis marks off micro-capacitance sensor, the cut zone and does not include breaker, the cut zone includes matching somebody with somebody
Net cut section, conveying cut section, load cut section, micro- source cut section and mixing cut section；Then, regulation contacts each cut section
The positive direction of electric current on the breaker in domain, build directed arc structure matrix M and
Wherein, n takes positive integer for the numbering and n of cut zone, and k is the numbering of breaker and k takes positive integer, mijFor directed arc structure Moments
Battle array M in either element andI be positive integer and i=1,
2 ..., n, j be positive integer and j=1,2 ..., k；
In the present embodiment, the breaker is digital breaker.
It should be noted that in the present embodiment, as shown in figure 1, being provided with breaker B1, breaker B2 in micro-capacitance sensor, breaking
Micro-capacitance sensor is divided into distribution cut section F1, conveying cut section F2, load cut section F3 by road device B3, breaker B4, breaker B5
With F5, micro- source cut section F4 and mixing cut section F6, for simplifying the analysis, the micro-capacitance sensor of cut zone in Fig. 1 is simplified,
Topological structure as described in Figure 2 is reduced to, wherein, it is distribution cut section F1, conveying cut section F2, load cut section F3 and F5, micro-
Source cut section F4 and the summit that mixing cut section F6 is topological structure, breaker B1, breaker B2, breaker B3, breaker B4,
Breaker B5 is as the side of topological structure, and due to the bi-directional current characteristic of micro-capacitance sensor, nondirectional matrix can not describe topological knot
Structure, therefore regulation contacts the positive direction of electric current on the breaker of each cut zone, and topological structure is described as there is direction.
As shown in Fig. 2 breaker B1 positive direction is from distribution cut section F1 flow direction conveying cut sections F2；Breaker B2's
Positive direction is from conveying cut section F2 flow direction load cut sections F3；Breaker B3 positive direction be from conveying cut section F2 flow to it is micro-
Source cut section F4；Breaker B4 positive direction is from conveying cut section F2 flow direction mixing cut sections F6；Breaker B5 positive direction
It is from micro- source cut section F4 flow direction load cut sections F5.
In the present embodiment, the numbering n of cut zone takes 6, and the numbering k of breaker takes 5, build directed arc structure matrix M and
Step 2: obtaining the active power instantaneous value for flowing through breaker and building side fault message matrix, process is as follows：
The active power instantaneous value P flowed through in step 201, collection breakerj；
In the present embodiment, the active power instantaneous value P flowed through described in step 201 on breakerjPassed by active power
Sensor is gathered.
Step 202, according to formulaCalculate the active power Sudden Changing Rate Δ P of j-th of breakerj, wherein,
For active power instantaneous value PjThe average active power in a upper cycle；
It is described in the present embodimentT is the sampling period, and p (t) is active power instantaneous value PjUpper one week
Any sampling active power of phase.
Step 203, structure side fault message matrix BFAnd BF=[bF1 bF2 … bFj … bFk], wherein, bFjFor j-th
The fault message of breaker andWherein, PεFor active power instantaneous value PjThreshold value,
bFj=1 represents j-th of breaker starting area failure, bFj=-1 represents j-th of breaker land failure, bFj=0 represents
The equal fault-free of cut zone being joined directly together with j-th of breaker；
It should be noted that in the present embodiment, as shown in figure 4, the side B1 where breaker B1, active before failure occurs
Power is just after failure generation and amplitude increases for just, then failure occurs in side B1 terminal area；
As shown in figure 5, the side B2 where breaker B2, active power is just, to be after failure generation before failure occurs
Just and amplitude reduce, then failure occur in side B2 origin zone；
As shown in fig. 6, the side B3 where breaker B3, active power is just, to be after failure generation before failure occurs
Just and amplitude reduce, then failure occur in side B3 origin zone；
As shown in fig. 7, the side B4 where breaker B4, active power is just, to be after failure generation before failure occurs
Just and amplitude reduce, then failure occur in side B4 origin zone；
As shown in figure 8, the side B5 where breaker B5, active power is just, to be after failure generation before failure occurs
Just and amplitude reduce, then failure occur in side B5 origin zone；
In summary, side fault message matrix BF=[- 1111 1], can determine whether that failure occurs in conveying cut section F2
It is interior.
Step 3: positioning failure cut zone, process is as follows：
Step 301, first, according to formulaCalculate the Reflector F of i-th of cut zonei, its
In, mij·bFj≠0；Then, build cut zone Reflector matrix F and
Step 302, judge whether broken down in cut zone：According to Reflector FiValue judge i-th segmentation
Whether broken down in region, as Reflector FiDuring equal to 1, broken down in i-th of cut zone, i-th of cut zone
For failure cut zone；Otherwise, i-th of cut zone is non-faulting cut zone；
It should be noted that the positioning in order to more intuitively describe failure cut zone, with reference to directed arc structure matrixThe Reflector of each cut zone is calculated, wherein, F1=m11×bF1=1 × (- 1)
=-1, F2=(m21×bF1)×(m22×bF2)×(m23×bF3)×(m24×bF4)=(- 1) × (- 1) × (1 × 1) × (1 × 1)
× (1 × 1)=1, F3=m32×bF3=(- 1) × 1=-1, F4=(m43×bF3)×(m45×bF5)=(- 1) × 1 × (1 × 1)
=-1, F5=m55×bF5=(- 1) × 1=-1, F6=m64×bF4=(- 1) × 1=-1, builds the Reflector of cut zone
MatrixIt is conveying cut section F2 that failure cut zone, which can intuitively be positioned,.
Step 4: the failure of failure cut zone is kept, process is as follows：
Step 401, setting fault-signal count flag matrix F J：Fault-signal is set to count mark for Reflector matrix F
Any fault-signal count flag FJ in will matrix F J and fault-signal count flag matrix F JiOriginal state be low electricity
It is flat, wherein, fault-signal count flag FJiFor Reflector FiFault-signal count flag and FJi=0；
It should be noted that setting fault-signal count flag matrix F J and fault-signal counting for Reflector matrix F
Mark matrix initial value be
The fault-signal count flag saltus step of step 402, failure cut zone：By the failure obtained in step 302 segmentation
The corresponding fault-signal count flag FJ in regioniState from the saltus step of low level 0 be high level 1, it is non-by what is obtained in step 302
The corresponding fault-signal count flag state of failure cut zone keeps low level 0；
It should be noted that in the present embodiment, cut section F2 failures are conveyed, and therefore, the corresponding failures of conveying cut section F2
Signal-count mark FJ2State from the saltus step of low level 0 be high level 1, i.e. now fault-signal count flag matrix
Step 404, according to formulaCalculate failure and update mark Fi', to Reflector FiCarry out more
Newly, wherein, x be positive integer and
It should be noted that the purpose that the failure of failure cut zone is kept is, after the determination of physical fault cut zone,
The associated direct tripping of breaker of respective regions, after breaker tripping, side fault information volume will change, failure point
Cut region also to calculate in real time, if calculating other failure cut zone side fault information volume changes again meets Reflector meter
When calculating result, the abnormal conditions for continuing to jump other breakers just occur, this is situation about occurring, it is therefore desirable to meter
The carry out Reflector holding processing of each failure cut zone calculated just can make breaker correct operation once, prevent
Only breaker misoperation.
In the present embodiment, mark F is updated using failurei' result performs the breaker of failure generating region and jump, failure updates mark
WillWhen conveying cut section F2 failures, therefore, the corresponding failures of conveying cut section F2
Signal-count mark FJ2State from the saltus step of low level 0 be high level 1, remaining fault-signal count flag is 0, therefore,After the breaker tripping that respective regions are associated, side fault information volume will change, failure cut zone
Also calculated in real time, if follow-up there is high level, but due to the corresponding fault-signal count flag FJ of conveying cut section F22First
There is high level and be always maintained at high level, therefore Reflector F1, Reflector F3, Reflector F4, Reflector F5Or
Reflector F6Though in which signal occur high level again, its corresponding fault-signal count flag be required forLow electricity
It is flat to carry out and computing, low level is obtained, high level no longer occurs, that is, shields other after conveying cut section F2 failures occur
Area fault signal, prevents the situation of malfunction from occurring so as to ensure that a correct operation of breaker.
Step 5: according to formulaCalculate the status signal S of j-th of breakerBj, lead to
The high level state signal of breaker is crossed, disconnection is performed to association breaker, wherein, F 'αFor the α cut zone failure more
New mark, F 'δMark is updated for the failure of the δ cut zone, and j-th of breaker connects α cut zone and δ
Cut zone, α, β, δ, ε be positive integer and
In the present embodiment, by obtaining the failure cut zone that each breaker is associated, by calculating each breaker
Status signalThe actual each breaker of control is jumped, and works as SBjIt is defeated
When going out for high level, corresponding breaker works as S by closing to pointBjWhen being output as low level, breaker is failure to actuate；Need explanation
It is, the status signal S of j-th of breakerBjThe shape of j-th of breaker can be determined by removing the arc structure matrix M' of direction signal
State signal SBjTwo cut zone of connection, and then obtain the status signal S of j-th of breakerBjExpression formula, the present embodiment
InTwo cut zone connected by each breaker of 1 element correspondence on column direction, enter
And Fault Isolation.
It is described above, only it is presently preferred embodiments of the present invention, not the present invention is imposed any restrictions, it is every according to the present invention
Any simple modification, change and equivalent structure change that technical spirit is made to above example, still fall within skill of the present invention
In the protection domain of art scheme.
Claims (4)
1. the exchange microgrid protection faulty action preventing method based on edge direction variable quantity, it is characterised in that this method comprises the following steps：
Step 1: splitting micro-capacitance sensor region and building the directed arc structure matrix of micro-capacitance sensor：First, using breaker physical location as
Basis, which is marked off, does not include breaker in the cut zone of micro-capacitance sensor, the cut zone, the cut zone includes distribution point
Cut area, conveying cut section, load cut section, micro- source cut section and mixing cut section；Then, regulation contacts each cut zone
The positive direction of electric current on breaker, build directed arc structure matrix M andIts
In, n takes positive integer for the numbering and n of cut zone, and k is the numbering of breaker and k takes positive integer, mijFor directed arc structure matrix
In M either element andI be positive integer and i=1,2 ...,
N, j are positive integer and j=1,2 ..., k；
Step 2: obtaining the active power instantaneous value for flowing through breaker and building side fault message matrix, process is as follows：
The active power instantaneous value P flowed through in step 201, collection breakerj；
Step 202, according to formulaCalculate the active power Sudden Changing Rate Δ P of j-th of breakerj, wherein,To have
Work(power instantaneous value PjThe average active power in a upper cycle；
Step 203, structure side fault message matrix BFAnd BF=[bF1 bF2 … bFj … bFk], wherein, bFjFor j-th of open circuit
The fault message of device andWherein, PεFor active power instantaneous value PjThreshold value, bFj=1
Represent j-th of breaker starting area failure, bFj=-1 represents j-th of breaker land failure, bFj=0 represents and jth
The equal fault-free of cut zone that individual breaker is joined directly together；
Step 3: positioning failure cut zone, process is as follows：
Step 301, first, according to formulaCalculate the Reflector F of i-th of cut zonei, wherein,
mij·bFj≠0；Then, build cut zone Reflector matrix F and
Step 302, judge whether broken down in cut zone：According to Reflector FiValue judge in i-th of cut zone
Whether break down, as Reflector FiDuring equal to 1, broken down in i-th of cut zone, i-th of cut zone is failure
Cut zone；Otherwise, i-th of cut zone is non-faulting cut zone；
Step 4: the failure of failure cut zone is kept, process is as follows：
Step 401, setting fault-signal count flag matrix F J：For Reflector matrix F, fault-signal count flag square is set
Battle array FJ and fault-signal count flag matrix F J in any fault-signal count flag FJiOriginal state be low level,
Wherein, fault-signal count flag FJiFor Reflector FiFault-signal count flag and FJi=0；
The fault-signal count flag saltus step of step 402, failure cut zone：By the failure cut zone obtained in step 302
Corresponding fault-signal count flag FJiState from the saltus step of low level 0 be high level 1, by the non-faulting obtained in step 302
The corresponding fault-signal count flag state of cut zone keeps low level 0；
Step 404, according to formulaCalculate failure and update mark Fi', to Reflector FiIt is updated, its
In, x be positive integer and
Step 5: according to formulaCalculate the status signal S of j-th of breakerBj, by disconnected
The high level state signal of road device, disconnection is performed to association breaker, wherein, F 'αMark is updated for the failure of the α cut zone
Will, F 'δMark is updated for the failure of the δ cut zone, and j-th of breaker connects α cut zone and the δ segmentation
Region, α, β, δ, ε be positive integer and
2. protect faulty action preventing method according to the exchange microgrid based on edge direction variable quantity described in claim 1, it is characterised in that：
The breaker is digital breaker.
3. protect faulty action preventing method according to the exchange microgrid based on edge direction variable quantity described in claim 1, it is characterised in that：
The active power instantaneous value P flowed through described in step 201 on breakerjGathered by active power sensor.
4. protect faulty action preventing method according to the exchange microgrid based on edge direction variable quantity described in claim 1, it is characterised in that：
It is describedT is the sampling period, and p (t) is active power instantaneous value PjAny sampling wattful power in a upper cycle
Rate.
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